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25cc engine bike drive gear

Old 06-17-05, 04:38 AM
  #26  
Brian
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If a motor on a bicycle offends you, go read another thread. Last year my wife and I built our tandem, starting with a custom Ti frameset. This year we got into BMX cruisers and a bit of racing. Next project? Choppers. They'll be pedal powered, but I'm sure at least one will end up with a petrol motor fitted into the frame. For the design we're using, we could even use an electric motor. Not quite the speed of my 400HP Camaro, but it will be a fun project. Some enthusiasts tinker with their bikes, and if they want to add a motor, I say go for it.
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Old 06-17-05, 06:29 AM
  #27  
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Originally Posted by infinityeye
I want to put a 25cc engine on a rear rack. attach it to a 53t road ring that is bolted to the wheel on a bike. I have rebuilt this little engine and got it idling again. I have all the stuff worked out except the "front" sproket. Does anyone know where I can get a sproket or sproket/centri clutch that will attach to this motor? It has a bell centri clutch on it now that ends in a square taper for a worm drive (weed wacker). I am thinking I need to remove this clutch and hopefully find a bolt on clutch/sproket to get the drive line in place.
Why not! Sounds like fun, I do goofy stuff like that all the time. Using your mind/skills to accomplish this kind of stuff keeps you young.

How about a centrifugal clutch like that used on mini-bikes & go-carts?
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Old 06-17-05, 03:23 PM
  #28  
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The Rabbitool motor is indeed super neat, but has been pretty elusive (vapour?). Birkestrand actually sold the rights to Sanyo who has been making the motors for a couple of years for the Japanese and European market.

Giant just released the SuedeE here in North America that uses that small Sanyo motor with a 36V, 9Ah NiMH battery. We've had a test bike in the shop for a few months and I'm pretty impressed: Good power (assist power, not motorcycle power), a neat Variable Power Control, and an understated kinda look.

What's really cool is that Giant is doing a (down-spec'd) version of this bike for the Mainland Chinese market and the economies of scale are gonna rock: This article talks about 250,000 electric bikes this year!
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Old 05-29-23, 08:54 PM
  #29  
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Point of self powered bikes

Originally Posted by Tweek
Can I ask, what's the point of a bike that is self powered? Is the world becoming so lazy we can't even pedal bikes anymore?
For you, a self powered bike may not make any sense, but for some, there are a variety of reasons. Yes, some may be lazy, but for others they may have physical limitations that prevent having a pedal only bike. I for one, love riding bikes and have friends who do as well who I used to ride with and am getting ready to join them again. However, I will be using a motorized bike due to disability.
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Old 05-29-23, 09:09 PM
  #30  
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Point of self powered bikes

Originally Posted by Tweek
Can I ask, what's the point of a bike that is self powered? Is the world becoming so lazy we can't even pedal bikes anymore?
For you, a self powered bike may not make any sense, but for some, there are a variety of reasons. Yes, some may be lazy, but for others they may have physical limitations that prevent having a pedal only bike. I for one, love riding bikes and have friends who do as well who I used to ride with and am getting ready to join them again. However, I will be using a motorized bike due to disability.
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Old 05-29-23, 09:25 PM
  #31  
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Is this a new record for Zombie Thread resuscitation?
You'd think they could have waited 19 more days and made it a full 18 years!
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Old 05-29-23, 11:26 PM
  #32  
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"E bikes" with throttles - i.e. that can be ridden without pedaling - are motorcycles, pure and simple but are considered "bicycles" just because they aren't noisy and smelly.

I'm even more dismayed that they and 20 mph "limited" pedal assist ebikes are taking over MUPs. They're obnoxious and unsafe for real pedal cyclists and pedestrians alike. I mean, it's actually a very rare pedal-only cyclist who can even ride 15-20mph for sustained times. I'm not saying that none can do it, there's plenty of fit people on these boards who do. But very few on an MUP, let alone one who's a big enough jerk to ride 15-20 mph on a MUP. I see it all the time nowadays, duffers riding 15-20mph ebikes on MUPs. Stupid local regs are being passed to allow this speed with ebikes and still be considered a "bicycle" for application of laws such as non-motorized use of MUPs etc. Plus lack of enforcement of the poor regs that are in effect.

I have no problem with ebikes in general: pedal assist limited to normal human speeds. For many of the folks riding them, that would be 8-10mph, 12 or 15 at the most.
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Old 05-30-23, 12:01 AM
  #33  
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Originally Posted by Camilo
"E bikes" with throttles - i.e. that can be ridden without pedaling - are motorcycles, pure and simple but are considered "bicycles" just because they aren't noisy and smelly.

I'm even more dismayed that they and 20 mph "limited" pedal assist ebikes are taking over MUPs. They're obnoxious and unsafe for real pedal cyclists and pedestrians alike. I mean, it's actually a very rare pedal-only cyclist who can even ride 15-20mph for sustained times. I'm not saying that none can do it, there's plenty of fit people on these boards who do. But very few on an MUP, let alone one who's a big enough jerk to ride 15-20 mph on a MUP. I see it all the time nowadays, duffers riding 15-20mph ebikes on MUPs. Stupid local regs are being passed to allow this speed with ebikes and still be considered a "bicycle" for application of laws such as non-motorized use of MUPs etc. Plus lack of enforcement of the poor regs that are in effect.

I have no problem with ebikes in general: pedal assist limited to normal human speeds. For many of the folks riding them, that would be 8-10mph, 12 or 15 at the most.
I'm old & decrepit with 28% lung capacity, so I'm SLOW.
The old neck doesn't rotate as much or as quickly as it used to either.
I do have a mirror, but when they are doing 3X my speed, OBJECTS APPEAR! I might have to veer around broken glass/trash etc. as they try to whiz by. They catch the end of the left bar, turn me into the curb and I'm probably going to have a broken "something" on my body.
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Old 05-30-23, 11:02 AM
  #34  
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18 year old zombie thread. Thread closed. If anyone is still interested in the subject and if it’s definitely cycling related as opposed to motorized, moped type ride, you can start a new thread.
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